1// Copyright (c) 2012-2016 The go-diff authors. All rights reserved.
 2// https://github.com/sergi/go-diff
 3// See the included LICENSE file for license details.
 4//
 5// go-diff is a Go implementation of Google's Diff, Match, and Patch library
 6// Original library is Copyright (c) 2006 Google Inc.
 7// http://code.google.com/p/google-diff-match-patch/
 8
 9// Package diffmatchpatch offers robust algorithms to perform the operations required for synchronizing plain text.
10package diffmatchpatch
11
12import (
13	"time"
14)
15
16// DiffMatchPatch holds the configuration for diff-match-patch operations.
17type DiffMatchPatch struct {
18	// Number of seconds to map a diff before giving up (0 for infinity).
19	DiffTimeout time.Duration
20	// Cost of an empty edit operation in terms of edit characters.
21	DiffEditCost int
22	// How far to search for a match (0 = exact location, 1000+ = broad match). A match this many characters away from the expected location will add 1.0 to the score (0.0 is a perfect match).
23	MatchDistance int
24	// When deleting a large block of text (over ~64 characters), how close do the contents have to be to match the expected contents. (0.0 = perfection, 1.0 = very loose).  Note that MatchThreshold controls how closely the end points of a delete need to match.
25	PatchDeleteThreshold float64
26	// Chunk size for context length.
27	PatchMargin int
28	// The number of bits in an int.
29	MatchMaxBits int
30	// At what point is no match declared (0.0 = perfection, 1.0 = very loose).
31	MatchThreshold float64
32}
33
34// New creates a new DiffMatchPatch object with default parameters.
35func New() *DiffMatchPatch {
36	// Defaults.
37	return &DiffMatchPatch{
38		DiffTimeout:          time.Second,
39		DiffEditCost:         4,
40		MatchThreshold:       0.5,
41		MatchDistance:        1000,
42		PatchDeleteThreshold: 0.5,
43		PatchMargin:          4,
44		MatchMaxBits:         32,
45	}
46}